This quest is just called "Mine" in the journal. It's really, really long, doesn't have a boss and when I tried it, it didn't spawn a single item that wasn't one of those random "drops from dead bodies" small items.
Is the themed loot spawning at all in this quest? I'd like you guys to make sure, if you could. It felt extremely unrewarding, given the time-investment.
Also, I suggest there be a boss at the end. The quest really could use something to spice it up. It's not easy but it does need something to mix things ups.
I would guess that it's related to this: http://www.efupw.com/forums/showthread.php?p=404700#post404700